While Trump and Kim concluded their summit in Singapore by signing a joint statement that promised “complete denuclearization of the Korean Peninsula,” it did not specify what that process would entail. According to the Washington Post, North Korea’s definition of “denuclearization” is different from Trump’s.

Trump described his meeting with Kim as “an interesting and very positive experience” and said North Korea “has great potential for the future.”

“Before taking office people were assuming that we were going to War with North Korea,” Trump added. “President Obama said that North Korea was our biggest and most dangerous problem. No longer — sleep well tonight!”

Not everyone is prepared to accept the president’s reassurances.

“What’s really disconcerting is that Trump announced unilaterally to the leader of North Korea that the United States is going to stop military exercises with our allies, without first telling our allies or even the Pentagon,” Michael Green, a senior vice president for Asia at the Center for Strategic and International Studies, told Yahoo News on Tuesday. “That’s astonishing.”

During his post-summit press conference, Trump admitted that he may be wrong about Kim’s willingness to denuclearize.

“I think he’s going to do these things,” Trump said. “I may be wrong. I mean, I may stand before you in six months and say, ‘Hey, I was wrong.’ I don’t know that I’ll ever admit that, but I’ll find some kind of an excuse.”

After arriving back at the White House, Trump lashed out at some of the television coverage of his agreement with Kim.

“So funny to watch the Fake News, especially NBC and CNN,” the president tweeted. “They are fighting hard to downplay the deal with North Korea. 500 days ago they would have “begged” for this deal-looked like war would break out. Our Country’s biggest enemy is the Fake News so easily promulgated by fools!”